What is the main story of the movie If You Are the One?

The genius of the returnee Roi (Ge You) invented the "divergent terminal", which was bought by venture capitalists at a high price of 2 million pounds because it could solve human differences fairly and peacefully. Roi also began to set foot on the road of online marriage, joking all the way. Either he met gay friends again, or he met a salesman. Roi is so disheartened that when he meets a cold woman, Liang Xiaoxiao (Shu Qi), he immediately asks the other party to explain his purpose. This time, it is even harder. I fell in love with a married man with a smile and struggled in The Loved. This time, I only came out to see Qin Fen because of my family's arrangement. The two people who never want to see each other again enthusiastically shared the biggest secret of their lives.

Soon, however, Xiaoxiao, who was ready to break up with her old love, found Roi and said that she would marry him, but she had to go to Hokkaido with him first. Because her love with her old love began there, and now she wants to end there. Roi agrees. When they set foot on a trip to Hokkaido, Roi's old friends in Hokkaido treated them warmly, and the three of them traveled all over Hokkaido. Roi knows that he can't get a smile, but he doesn't know that the knot in the smile is rushing to the bottom of the sea. ...